Die for making a t-shaped part



May2l,1940.

H. CADWALLADER, JR

. DIE FOR MAKING A T-SHAPED PART Filed Dec. 2, 1937 Win n m5 I1 1 ML M H6 a w ,1 W m a Patented May 21, 1940 UNITo STATES PATENT OFFICE DIE FOR.MAKING A T-SHAPED PART Harry Cadwallader, Jr., Philadelphia, Pa.

Application December 2, 1937, Serial No. 177,828

4 Claims.

. The present invention relates to drop forging dies and moreparticularly to the drop forging of T-shaped parts, such as nuts, boltheads, and

the like.

5. In the manufacturing of T-shaped parts, it

has heretofore been the practice to either machine a piece of oblong orsquare steel bar stock to shape, or to prepare a die having a partingline at right angles to the flanges and machined to the required shape.Both of these prior methods require milling, planing, and cuttingoperations in the removal of excess metal, and to finish to shape, aswell as centering for drilling, or hole sizing, and counter-sinkingoperations. All of this work is not only costly in itself but requiresjigs and special fixtures for each operation.

Some of the objects of the present invention are to provide a new andnovel die for forging 20 T-shaped parts; to provide a forging operationwherein machining operations are reduced; to provide a die for forgingT-shaped parts whereby special jigs and fixtures are not required afterthe forging operation; to provide a die for forg- 25 ing T-shaped partswhereby surfaces heretofore necessitating finishing operations areobtained without such finishing operations; to provide a die for forgingT-shaped parts wherein the parting line of the die is parallel to thetop and bot- 30 tom faces of the flanges; and to provide otherimprovements as will hereinafter appear.

In the accompanying drawing, Fig. 1 represents a perspective of one partof a die embodying one form of the present invention; Fig. 2

35 represents a perspective of the other part ofthe die; Fig. 3represents a section on line 3-3 of Fig. 1; Fig. 4 represents a sectionon line 4-4 of Fig. 2; Fig. 5 represents a perspective of the T-shapedpart as formed by the coaction of the 40 die parts of Figs. 1 and 2;Fig. 6 represents a section on line 6-6 of Fig. 5; and Fig. 7 representsa sectional elevation of a modified form of die.

Referring to the drawing, one form of the present invention consist of adie formed by parts I and II, which are arranged to abut on faces I2 andI3 as the parting line of the die. The die part III is formed with thecavity I4, which is complemental in configuration tothe shape of oneportion of the article to be forged, and, in this instance, is formed bytwo substantially rectangular walls I and I6 of different width but ofthe same length. The wall I5 joins the wall I6 along two opposite sidesby two surfaces I'I, lying in the same horizontal plane, and having thefunction of forming the two upper finished faces I8 on the flanges 20 ofthe forged part 2|. That portion of the cavity I4 bounded by the wallsIt is shaped to form the substantially rectangular base block 22 of thefinished part. 5 i

In order that the shank receiving hole 23 of the article can bepartially formed during the forging operation, the bottom of the cavityI4 is provided, in the proper location, with a forming projection 24 ofsubstantially conical shape, and of a length just sufiicient to displacethe amount of metal necessary to create a depression without causing anexcess of metal being forced into an adjoining area, where its presenceis detrimental to the proper shaping and finishing of the fiat surfaces.

The die part I I, which coacts with the part ID to form a completeforging, is provided with a cavity 25 complemental in configuration tothe shape of that portion of the article which is not shaped by the dieI 0. This cavity 25, in the present instance, is formed by asubstantially rectangular wall 26, and a bottom 21, the dimensions beingsuch that when the two die parts I0 and II are in face to face operativeposition, the two cavities I4 and 25 register one with the other to forma complete metal shaping chamber.

In order that the shank receiving hole 23 may be partially formed in thebottom of the head portion of the forged part, a centrally disposedprojection 28 is located in the cavity 21 in such a position that ittakes a coaxial relation with the projection 24 when the two die partsare superposed. Thus the two projections 24 and 28 function to centerand form two holes respectively at the top and bottom of the forgedpart, whereby a minimum of drilling is required, and the usual centeringoperation eliminated.

Attention is directed to the fact that since the parting plane 3|] is inthe head and lies parallel to the bottom of the head, as well as thesurfaces I8, the bounding walls I5, I6 and 26 can be shaped with aminimum of angularity, thereby permittting the die to be drawn easilywithout roughened edges or irregular corners. In other 5 words the baseblock 22 as forged by the present invention is accurately dimensionedfor correct coaction, with a machine slot of the T-type.

In Fig. 7 a modified form of the invention is shown wherein provision ismade to form a counter-sink about the two holes formed by projectionsHand 28. Thus the projection I4 in die part II] is encircled at its baseby a bevelled surface 3|, and the projection 28 in die part I I isencircled at its base by a bevelled surface 32.

These surfaces 3| and 32 are properly dimensioned in order torespectively form similar depressions about the ends of the shank hole23.

It will now be apparent that a. complete unitary die has been devisedfor making drop forgings of T-shape, and wherein the plane of parting isin the head and is parallel to the main flat surfaces of the articleinstead of at right angles thereto as has heretofore been the generalpractice. This shifting of the plane of parting results in new andunexpected results in that surfaces which had to be heretofore milled,planed and finished, are now finished in the forging operation. Also thecentering operation for the shank .hole is dispensed with, as also themajor part of the drilling.

While one form of the invention and a modification thereof are shown, itis to be understood that the invention is not limited to the exactconstruction as shown but may be varied according to requirementswithout departing from the spirit of the invention. For example theprojections 24 and 28 are preferably formed as integral with the dieparts, but it isto be understood that these might be removable insertsand still be within the scope of the invention.

Having thus described my invention, I claim:

1. As a new article of manufacture, a two part die for forging aT-shaped nut blank, having its parting plane in the head of the Tand'parallel to the top and bottom faces of the flanges forming thehead.

2. As a new article of manufacture, a two part die for forging aT-shaped nut blank, having its parting plane in the head of the T andparallel to the top and bottom faces of the flanges forming the head andhaving a punching projection on one of its parts.

3. As a new article of manufacture, a two part die for forging aT-shaped nut blank, having its parting p1ane in, the head of the T'andparallel to the top and bottom faces of the flanges forming the head andhaving a punching projection on each of its parts.

4. As a new article of manufacture, a two part die for forging aT-shaped nut blank, having its parting plane in the head of the T andparallel to thetop and bottom faces of the flanges forming the head andhaving a punching projection on each of its parts, said projectionsbeing coaxially aligned.

HARRY CADWALLADER, JR.

